Brake drum and lining



MQ if ,639,519` A. LoNsoN BRAKE DRUM AND LN'ING Filed Aug. 13, 1925 F .2',

Aug. 16, 1927.

INVENTOR wrrNEssEs v Q' [107243017 @Zujmu ATTQ'RNEY etented Aug. 16, 1927.

i UNITED j STATES ALBERT LONSON', 0F ULEN, MINNESOTA This invention relates to an improved brake drum and lining` especially adapted for motor vehicles, its objects being to provide a brake which is eflicient in its operation, inexpensive to manufacture, and in which the lining may be very easily replaced .when worn.

The objects and advantages of the invention will be more fully explained in the following detailed description, which-is to be considere-d in connection with the accompanying drawing illustrating the same.

In the drawing:

Figure l is a transverse section through a brake drum and lining. .constructed in accordance with the invention, the brake bands being shown in connection therewith.

Figure 2 is a side elevation 'of the brake drum and .lining detached.

Figure 3 is a View similar to Figure l, but showing a modified f orm of the invention. vFigure 4 is a side elevation of the brake drum shown in Figure 3.

-in the form illustrated in Figures 1 and 2, le the drinn 5 is termed with a cylindrical p0rtion (3 having a series of slots 7 therein forming a series nt comparatively wide web portions 8, which alternate with a series ot' coinparaiivel'v narrow wel) portions 9. A friction hand o'r lining '10 is threaded through the slots 7', passing over the outer face of each web portion 8 and over the inner face ol each weh portion Si'. A clamping strip 1l is-se: urcd to one of the web portions 9 by a screw l2. or other suitable means, so as to seni-ely chimp the end portions of the lining it) between the strip ll and the adjacent the wel) portions 8. The outer or ser brune band 1S is of the usual type, i co inc' ot a resilient steel strip connected at its ein to a pivoted member 14, which may he rocked to contract the band. The

emergency brake comprises an inner band l5, united in the usual manner on a pin 16, .md normally held out of engagement with the :lruin by the tension ot' springs 1T, which are connected to lugs or hooks i8 formed on the inside of the hand.

The ends of the hand l5 are engaged by a cam 1S), which mayl nient with the drum.

ln the forni'shown in 7Qigures 3 and 4, the peripheral portion of the drum is separated bv'siots 22 into a series of comparativelyvvide segments 2i, 'alternating with comparatively narrow segments In this 543 he rocked to expand the same into engage BRAKE DRUM N15 LINrNG.

Application inea August 13, 1925. 'serial Np. 50,049.

form, however, the slots extend to the edge of the drum, soY that the lining 24 may be made in theform ofen endless band which may be inserted' from the side of the drum.` 60 This friction band, like the band lO, when 1n operative position, passes over the outer Y faces of the segments 2l and the inner faces i of the segments 22. The usual resilient. serv-l ice band is used to engage the outer face 65 of the drun'nand is adaptedto be contracted by rocking the' member 26 which is connected to itslen'ds. The emergency or inner brake band 27 is mounted in the usual manner on the pin 28,l and normally held out of 7-.0 contact with the drum by the tension of ksprings 29, which are connected to lugs or hooks 30 formed on the inside of the band. The ends of the band are engaged by a cam 31, which may be rocked to expand the band into engagement with the drum. In this form, however, the outer face of the band 27 is formed with a series ot' recesses 32,corresponding in number to the number of segments 22 and spaced the same distance apart'` 8U so that when the emergency brake is applied the portions of the lining 24, which pa'ss over f the inner faces of the segments 22, tend to en'.- gage `in the recesses 32 to set or lock'the wheels. This feature is of advantage, since the emergency brake is 'generally used to hold the automobile in a stationary position, and this result may be accomplished with a very small amount of pressure.

ln a brake constructed according to the 9U invention. it is to be noted that air spaces are lett beneath the outer band' 13 between the segments ot' lining l0 with which it engages. This permits greater pressure to be applied without causing the hand or lining to become excessively heated. These air holesv also permit the escape of any dirt or particles of gravel which may get under the band it.' lSince the lin-ing is carried on the rotating drum, the wear is evenly distributed l0 throughout its entire circumference. Since the lining is not attached to the band, the latter is more flexible and more uniformlyv engages the surface against which it is drawn. Since the braking surface is outside W5 o t' theli'ning instead otxinside, thc distance from the axis is greater. and the. leverage correspondingly increased. 1When the linine becomes worn itmay be very easily replacer and few, it' any, rivets are required. With 110 the form shown in Figure 3. when the automobile is standing still and the emergency loi-elsey applied, the Wheels ere pi'scticsily locked even though very little pressure is used in applyingthe brake.

While l have shown and described the construction of then invention in detail, it is to he understood that this is merely illustrative and that various other modifications may be merle in the detailed construction or" the various elements and the manner in which they are used VWithout departing nieto rislly from the essentiel tea-tures of the invention. ltv is my purpose, therefore, to incluole all such modifications Within the scope of the sppendeti claims.

`Ivlihzit is claimed is:

l. A brake Jlor motor vehicles comprising,

in combination, e suhstintielly cylindrical drum presenting e series of slots, e relatively Wide strip oit' brake iining thresfietl through seid slots having alternating service brake and emergency brake portions on the outer and inner peripheries thereof and anv emergency brake shoe having Idepressions therein to receive the inwardly projecting portions of the lining andtenfling to lock the drum ypositively against movement l` 2. in a broke, the combination of e hollow drnm having e series of slots through its i peripheral portion, e friction element pass ing in and onty through seid slotsn so that it passes alternately inside and outside of seifl peripheral portion, inner brake bend inside the drinn and normally out o Contact therewith, ineens for expanding said brake bend, seid hrslie hand having recesses adapted to receive theinside'portions of said. friction element to ioclr the drum to the hand, an outer brake bend normally ontoi Contact with the drum, and. means for contracting the outer bend to engage the out side portions ozi seid. friction element.

3 in e brake, the combination of s hollow drum having a series of' siots throuvh its peripheral portion forming s series or coinpsratively Wide arcuate strips alternating with comparatively.narrow ones, e friction element passing through seid slots insitieof each narrow strip and outside of each Wide stripa en inner brake hand insieie the lh-relie drum and normally ont et contact with. seitl 'friction elenfient9 ineens for expendio@ the inner brake handy.. sei inner orelte .sn hsving iecesses adapted to receive the inside portions of ssiol friction element loci; the fum to the bend, enel en outer breite hand disposed in cooperative-relation to the ontsitle portions oi seid friction element.

el. ln s breke the combination of s hollow drum hsving` a series oi" slots extending from one edge of its peripheral portion nearly to the other edge thereof to form e series of segments, s friction element passing in and out through seid slots inside o" slternete segments enel outside of the other segments, en inner lorolre heini inside the hrelie drum and normally out of contest therewith, ineens for'expsnding seid brake hand, seid breite-bend having recesses sdspted to receive the inside portions of said friction element to loch the drum to the hand when the letter is espandel', end en outer brake bond adapted to cooperate with the outside portions oi"- ssid 'friction element( 1 5. ln s breite? the combination ot' s hollow drinn having a series of slots extending from one edge of its peripheral portion nearly to the other edge thereof end dividing the same into s series of comparatively wide segment-s alternating with comparetiveiy nrrow segments, e friction element passing throngh seid slots inside of each narrow segment and ont-side of each wide segment, en inner hreiie handinsifle the drinn enel normally ont of Contact therewith end hei/ing recesses in its outer fece corresponding in .size end numher to the narrow segments, meansfor expending seid yinner brake band to canse seid recesses to engage the narrow segments to ioclr the drum to the bend, anti en outer hrslxe bend afispted to cooperate with the outside portions of the friction element.

ln testimony that l claim the foregoing es my own, l have hereto sxed my signstnre.-

spesse Lesson.,

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